Leersum is a town in the municipality of Utrechtse Heuvelrug in the Dutch province of Utrecht. It lies about 7 km east of Doorn and 9 km west of Veenendaal. In 2001, the town of Leersum had 6013 inhabitants. The built-up area of the town was 1.44 km2; it contained 2465 residences. Until 2006, Leersum was its own municipality, covering both the town of Leersum and neighbouring Darthuizen. In June 2021, Leersum was hit by a downburst. Many cars and homes were heavily damaged by falling trees.